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4w-21+5w=57
We simplify the equation to the form, which is simple to understand
4w-21+5w=57
We move all terms containing w to the left and all other terms to the right.
+4w+5w=+57+21
We simplify left and right side of the equation.
+9w=+78
We divide both sides of the equation by 9 to get w.
w=8.66666666667
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